6. If you enter 234.567 into a cell that is formatted to display 1 decimal place, what is the value stored in the cell?
2 answers:
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Answer:
Here is the C++ program:
#include <iostream> // to use input output functions
#include <cmath> // to use math functions like sqrt()
#include <iomanip> //to use setprecision method
using namespace std; //to access objects like cin cout
int main () { //start of main function
double speedA; //double type variable to store average speed of car A
double speedB; //double type variable to store average speed of car B
int hour; //int type variable to hold hour part of elapsed time
int minutes; //int type variable to hold minutes part of elapsed time
double shortDistance; // double type variable to store the result of shortest distance between car A and B
double distanceA; //stores the distance of carA
double distanceB; //stores the distance of carB
double mins,hours; //used to convert the elapsed time
cout << "Enter average speed of car A: " << endl; //prompt user to enter the average speed of car A
cin >> speedA; //reads the input value of average speed of car A from user
cout << "Enter average speed of car B: " << endl ; //prompt user to enter the average speed of car B
cin >> speedB; //reads the input value of average speed of car A from user
cout << "Enter elapsed time (in hours and minutes, separated by a space): " << endl; //prompts user to enter elapsed time
cin>> hour >> minutes; //reads elapsed time in hours and minutes
mins = hour * 60; //computes the minutes using value of hour
hours = (minutes+mins)/60; //computes hours using minutes and mins
distanceA = speedA * (hours); // computes distance of car A
distanceB = speedB * (hours); //computes distance of car B
shortDistance =sqrt((distanceA * distanceA) + (distanceB * distanceB)); //computes shortest distance using formula √[(distanceA)² + (distanceB)²)]
cout << "The (shortest) distance between the cars is: "<<fixed<<setprecision(2)<<shortDistance;
//display the resultant value of shortDistance up to 2 decimal places
Explanation:
I will explain the program with an examples:
Let us suppose that the average speeds of cars are:
speedA = 70
speedB = 55
Elapsed time in hours and minutes:
hour = 2
minutes = 30
After taking these input values the program control moves to the statement:
mins = hour * 60;
This becomes
mins = 2 * 60
mins = 120
Next
hours = (minutes+mins)/60;
hours = (30 + 120) / 60
= 150/60
hours = 2.5
Now the next two statements compute distance of the cars:
distanceA = speedA * (hours);
this becomes
distanceA = 70 * (2.5)
distanceA = 175
distanceB = speedB * (hours);
distanceB = 55 * (2.5)
distanceB = 137.5
Next the shortest distance between car A and car B is computed:
shortDistance = sqrt((distanceA * distanceA) + (distanceB * distanceB));
shortDistance = sqrt((175 * 175) + (137.5 * 137.5))
= sqrt(30625 + 18906.25)
= sqrt(49531.25)
= 222.556173
shortDistance = 222.56
Hence the output is:
The (shortest) distance between the cars is: 222.56
Answer:
Here is the C++ program:
#include<iostream> //to use input output functions
#include <algorithm> //to use tolower() function
using namespace std; //to identify objects like cin cout
int main() { //start of main function
string text; // to hold text input
cout<<"Enter a line of text: "; // prompts user to enter a string
getline(cin,text); // reads the input string (text) from user
transform(text.begin(), text.end(), text.begin(), ::tolower); //converts the text into lower case
int letter[26] = {0}; //to hold the letters
int i; // used as a loop variable
int words=0; // to hold the count of words
for(i = 0; i< text.size();i++){ // iterates through the text
if(isalpha(text[i])&&(text[i+1]=='.'||text[i+1]==','||text[i+1]==' ')) //checks if the character at i-th index of text is a letter, and checks if i+1 index position of text is a period, comma or a space
words++; // adds 1 to the count of words
if(isalpha(text[i])) // if the character at the i-th index of text is a letter
letter[text[i]-'a']++; } // counts the occurrences of each letter
char j = text[text.size()-1]; // sets j to the last character of text
if(j != '.' && j!= ' '&& j!=',' &&j!= '\0') //if the last character is not a period or empty space or comma or end of lone
words++; //add 1 to the count of words
cout<<"Number of words: "<<words<<endl; //display the number of words in the text
for(i=0; i<26; i++) { //iterates 25 times
if(letter[i]>0) //if letter at index i is greater than 0
cout<<(char)('a'+i)<<" : "<<letter[i]<<endl; }} //displays each letters and its number of occurrences in the text
Explanation:
The program is explained in the attached document with an example.
